xAxis and categoryAxis, and yAxis, and valueAxis

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In the chart configuration: is xAxis the same as categoryAxis and is yAxis the same as valueAxis or is there a difference?

It looks like a chart may have many y axes, each of which is an instance of a valueAxis. Each series must specify the y-axis against which it is plotted by setting the series.axis to be equal to the yAxis.name. However, what, then is the purpose of the valueAxis configuration?

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